autoconf removal / Build error: KDE requires autoconf 2.53 or newer (kmastermind)

[Jan Henrik Sylvester]

portupgrade kmastermind-2.2_1 to kmastermind-2.2_2 failed:

*** AUTOCONF NOT FOUND!.
*** KDE requires autoconf 2.53 or newer

What should I do about it?

Moreover, portupgrade does not deal with this:

autoconf-2.53_4             <  needs updating (port has 2.61_2)
autoconf-2.59_3             <  needs updating (port has 2.61_2)
autoconf-2.61_2             =  up-to-date with port

/usr/ports/UPDATING has no instructions what to do with the obsolete 
autoconf versions. Shall I remove them although autotools-20070905, 
kde-3.5.7, and kdevelop-3.4.1_2 still "require" them? Can I do that 
without rebuilding kdevelop?

I thought about:

pkgdb -s /autoconf-2.53_4/autoconf-2.61_2/
pkgdb -s /autoconf-2.59_3/autoconf-2.61_2/
pkg_remove -f autoconf-2.53_4
pkg_remove -f autoconf-2.59_3
pkgdb -F

Would this do it? Or would I have trouble later on?

Thanks,
Jan Henrik